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- W2124927380 endingPage "5338" @default.
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- W2124927380 abstract "The Hex mismatch repair system of Streptococcus pneumoniae acts both during transformation (a recombination process that directly produces heteroduplex DNA) to correct donor strands and after DNA replication to remove misincorporated nucleotides. The hexB gene product is one of at least two proteins required for mismatch repair in this organism. The nucleotide sequence of a 2.7-kilobase segment from the S. pneumoniae chromosome that includes the 1.95-kilobase hexB gene was determined. The gene encodes a 73.5-kilodalton protein (649 residues). The spontaneous hex Rx chromosomal mutant allele with which a mutator phenotype has been associated is shown to result from a single base substitution (TAC to TAA) leading to a truncated HexB polypeptide (484 residues). The HexB protein is homologous to the MutL protein, which is required for methyl-directed mismatch repair in Salmonella typhimurium and Escherichia coli, and to the PMS1 gene product, which is likely to be involved in a mismatch correction system in Saccharomyces cerevisiae. The conservation of HexB-like proteins among procaryotic and eucaryotic organisms indicates that these proteins play an important common role in the repair process. This finding also suggests that the Hex, Mut, and PMS systems evolved from a common ancestor and that functionally similar mismatch repair systems could be widespread among procaryotic as well as eucaryotic organisms." @default.
- W2124927380 created "2016-06-24" @default.
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- W2124927380 date "1989-10-01" @default.
- W2124927380 modified "2023-10-18" @default.
- W2124927380 title "Nucleotide sequence of the Streptococcus pneumoniae hexB mismatch repair gene: homology of HexB to MutL of Salmonella typhimurium and to PMS1 of Saccharomyces cerevisiae" @default.
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- W2124927380 doi "https://doi.org/10.1128/jb.171.10.5332-5338.1989" @default.
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